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Sept. 13, 1932. A. o. AUSTIN JOINT FOR CABLES AND OTHER DEVICES FiledMay '7', 1929 1V Vii/V TOR Patented Sept. 13, 1932 STATE UNETE ARTHUR O.AUSTIN, 0F NEAR BARBERTC N, OHIO, ASSIGNQR, BY MESNE ASSIGNMENTS TO THEOHIO BRASS COMPANY, OF MANSFIELD, OHIQ, A CQRPOBATION OF NEW JOINT FORGABLES AND OTEER DEVICES Application filed May '2, 1929. Serial No.361,204.

This invention relates to joints between metallic and non-metallic partssuch as may be used for connecting porcelain sleeves for sectionalizingthe outer metal sheath of insulated conductor cables and for otherdevices where it is desirable to connect metal with porcelain or likematerial.

The invention has for one of its objects the provision of a joint ofthis nature which shall be liquid or oil tight and mechanically strong.

Other objects and advantages will appear from the following description.

The invention is exemplified in the combination and arrangement of partsshown in the accompanying drawing and described in the followingspecification and in the steps of the process described in thespecification. The novel features of the invention are more particularlypointed out in the appended claims.

The present application is in part a continuation of application, SerialNumber 120,087, filed July 2, 1926.

In the drawing, the figure is an elevation with parts in section showingone embodiment of the invention applied to the metal sheath of aninsulated conductor.

In the construction of cable joints, bushings, and other articles, it isfrequently desirable to make a joint between metal and porcelain orsimilar material which will be air or oil tight and which will alsoprovide mechanical strength. While in some cases tightness andmechanical strength are both important, in other, tightness ormechanical strength alone may be essential.

In the form of the invention shown in the drawing, an insulating sleeveor section is inserted in a cable sheath to break up longitudinalcurrents in the sheath. The porcelain sleeve 12 is interposed betweenadjacent portions of the cable sheath 13.' The outer surface of theporcelain 12 to be attached to the metal sheath 13 is provided with ametalized surface 14 similar to that described in my prior Patent Number1,536,749, issued May 5, 1925. As explained in that patent, the surfaceof the porcelain before firing is covered with a liquid glaze and parofthe lead sheath 13. wrapping 18 is to prevent loosenes's of the ticlesof unfiredporcelain are distributed over the surface thus treated andadhere to the glaze material. l Vhen the piece is fired the glazehardens and firmly secures the particles to the surface from which theyproject forming a roughened or sanded surface. The sanded surfaceprovides a good bond so that a metallic coating may be applied theretoeither by electric deposit or by other suitable'coating means such as anair or Shoup gun. If desired the portions to be plated may be given aconducting deposit of silver by the method used in coating mirrors or byany other suitable method which will give a conducting surface so thatan electric deposit can be started. The electrical deposit may then beformed of any suitable metal such as copper or zinc. After the depositis formed, the plated portion may be tinned by using a flux and anysuitable metal such as tin or an alloy of tin and lead; the operationbeing similar to that employed in providing a tinned surface for solder.It is generally preferable to use a substance for this ti-nningoperation which will melt readily and which will not damage theporcelain or dielectric'or tend to destroy the metallic film under thesurface coating. After the surface of the porcelain has been thustreated.' the lead sheath is removed from a section of the cable and aportion of the sheath 13 is belled or flared outwardly as shown at 15.

The exposed portion of the nsulating covering 16 for the conductor 17may be given a thin wrapping 18 of flexible insulating material such ascambric or paper, the thickness of the wrapping 18 beingsubstantiallvthat The purpose of the sleeve 12 on the insulation 16 when the sleeveis in place. Unless the sleeve 12 is located at a point where the cableis spliced, it will have to be slid into place along the cable and vmusttherefore have a sufficiently large opening to receive the cable,including the lead sheath. Both ends of the sleeve 12 are tapered andprovided with a metallic coating and one end is inserted beneath theflared end of the sheath 13 until the other end passes the othertermination of the lead sheath.

' forations 21 through This last named portion of the sheath is thenflared outwardly and the sleeve 6 moved back until both ends projectbeneath flaredportions of the lead sheath 13. The lead sheath 13 is thenpressed inwardly until it fits closely about the ends of the sleeve 12and engages a portion of the metalized surface 14. A helix ofreinforcing wire 19 is slid along the cable until it surrounds theoverlapping portions of the sheath 13 and sleeve 12 as shown in thedrawing. A further reinforcement 20 of sheet metal may be providedenclosing the wire 19. The reinforcing members 19 and 20 may be formedof any suitable metal having sufiicient mechanical strength and a highercoefficient of thermal expansion than the sleeve 12. When thereinforcement 20 is in place, attaching or filling metal 21, in a moltenstate is poured into the space about the joint and alloys with thecoating 14 and the sheath 13 thus forming a perfectly tight joint. Asuitable flux may be used to facilitate the union of the attaching metalwith the other parts. It is not essential that a molecular union beformed between the attaching metal and the reinforcement but such aunion may in some cases be desirable. The parts will be heated by theattaching metal and the member 20 will expand to a greater extent thanthe sleeve 12 so that when the parts are again cooled the member 20 willexert force on the attaching metal pressing it firmly against the sheath15 and the coated surface 14. In some instances it may be desirable touse a reinforcing metal having a higher coeflicient of thermal expansionthan the attaching metal. In this case if a leadtin solder is used forthe filling metal, zinc may be used for the reinforcing member. In somecases it may be found advantageous to add antimony to the attachingmetal so that it will contract but little if any in cooling or may evenbe made to expand, thus insuring complete filling of the space betweenthe member 20 and the surface 14, after the joint has cooled, and permitthe reinforcing member to exert the full effect of its contractive forceon the joined surfaces. This will overcome any tendency for the joint towork loose. Where an antimony alloy is used for the filling metal, thereinforcement need not be of zinc but other metals such as copper may beused for this member. The reinforcing member 20 may be provided with oneor more perwhich the solder is poured into the joint and the sleeve 12may be perforated as shown at 22 and provided with a filling plug 23through which the interior of the cable may be vented or supplied with asuitable filling compound. The plug 23 may be cemented in place or theinterior of the opening 22 may be roughened and metalized and the tubesoldered in position.

It will be apparent that the joint described is equally useful forattaching cables to potheads or other terminal members as well as tosectionalizing insulators.

The metalized surface of the porcelain will permit the solder to form atight joint with the surface of the porcelain so that there is no dangerof leakage. The reinforcement provides mechanical strength to theotherwise comparatively weak solder so that the solder is held firmlyagainst the surface of the porcelain and danger of mechanical rupture ofthe joint is thus prevented.

It will be apparent that the form of joint described may be used for agreat many purposes where it is desirable to connect porcelain orsimilar material to metal parts.

I claim:

1. The combination with a cable having a conductor, an insulatingcovering and an outer metal sheath, the end of said sheath be ing flaredoutwardly, of a dielectric sleeve surrounding said insulating coveringand having a tapered portion extending between said sheath and saidinsulating covering, the outer surface of said tapered portion beingroughened and coated with metal, attaching metal for securing saidcoated surface and sheath together, and a reinforcing member forpreventing mechanical separation of the joint between said sheath anddielectric sleeve.

2. The combination with a conductor having an insulating covering and anouter metal sheath, of a porcelain sleeve surrounding said covering atthe termination of said sheath, said porcelain sleeve having a taperedportion extending between said insulating covering and metal sheath,said tapered portion being roughened and coated with metal, attachingmetal securing said coated surface to said sheath, and a reinforcingmember for holding said attaching metal in position and for preventingmechanical separation of said attaching metal from said coated surface.

3. In combination a cable having an outer metal sheath and a porcelainsleeve disposed about said cable adjacent the end of said sheath, saidsleeve having a portion of the surface thereof coated with metal, thesheath overlapping said coated portion and connected thereto by solderfor forming a physically tight joint, the solder overlapping said sleeveand sheath, and reinforcing means extending about the periphery of saidsleeve and sheath and embedded in said solder and acting to hold saidsolder against said sleev'. and sheath.

In testimony whereof I have signed my name to this specification this3rd day of May A. D. 1929.

ARTHUR O. AUSTIN.

